I'm just trying to figure out what's actually going on in these demos on a technical level. They keep throwing around terms that make me suspect they've done a fair amount of work into actually connecting the virtual and the physical world, on a basic software level.
This definitely resonates strongly with me as I've been fascinated by such problems since I was a child. The involvement of Minecraft also makes a lot of sense once you look at it from an interface oriented point of view. The importance of Minecraft is that it launched a (hugely popular) platform with a very simple homogeneous interface that can represent interaction with a 3D environment in the general sense. Even though the interaction is very crude and simplistic, it's also quite robust in the sense that many different kinds of content can be represented with it. Which is why we've seen everything from 1:1 replicas of the Enterprise to huge organic looking structures etc. The fact that it is both extremely popular as well as robust and possible to iterate on makes it a very good candidate for a basis for future standard AR interfaces, in the same way the mouse and cursor were an important basis for graphical interfaces.